/**
* Adds a specified number of weeks to the current system date.
*
* @param {number} weeks - The number of weeks to add (supports negative numbers to subtract).
* @returns {Date} A new Date object representing the future date.
*/
function addWeeksToCurrentDate(weeks) {
// 1. Create a new Date instance for the current time to avoid mutating global/external state
const currentDate = new Date();
// 2. Get the current day of the month and add the total days (1 week = 7 days)
// setDate() automatically handles month/year rollovers and leap years.
currentDate.setDate(currentDate.getDate() + weeks * 7);
return currentDate;
}
// ==========================================
// Usage:
// ==========================================
const weeksToAdd = 4;
const futureDate = addWeeksToCurrentDate(weeksToAdd);
// Format the resulting date nicely as YYYY-MM-DD (ISO format)
const formattedDate = futureDate.toISOString().split('T')[0];
console.log(`Adding ${weeksToAdd} weeks gives: ${formattedDate}`);
/*
run:
Adding 4 weeks gives: 2026-12-05
*/
